A powder-coated door and its manufacturing process

Abstract

This invention relates to the field of door manufacturing technology, and more particularly to a powder-coated door and its manufacturing process. The manufacturing process of the powder-coated door includes the following steps: S1. Processing a sheet of a first material into a base plate, and processing a sheet of a second material into an outer frame and a face plate, multiple base plates forming a basic frame, arranging a perforated plate within the basic frame, and covering the outer frame around the basic frame to obtain an intermediate frame, with multiple first ventilation holes formed on the intermediate frame, the first ventilation holes penetrating the perforated plate, the base plate, and the outer frame; S2. Applying adhesive to the surface of the intermediate frame, and then hot-pressing the face plate on both sides of the intermediate frame to obtain a blank plate; S3. Sealing the edges of the blank plate and then spraying powder to obtain the powder-coated door. By adjusting the overall structure, bonding process, and edge-sealing process of the powder-coated door, raised marks will not appear on the edges of the door after the powder coating process is heated.

Description

Technical Field

[0001] This invention relates to the field of door manufacturing technology, and in particular to a powder-coated door and its manufacturing process. Background Technology

[0002] Research revealed that existing powder-coated door products on the market typically have a coating on the edges of the door panel, such as... Figure 1 The mark shown at point A in the middle makes the overall appearance of the door panel product unsightly.

[0003] Verification revealed that the formation of the aforementioned marks was primarily related to the three-layer structure of the door panel and the adhesive used for bonding.

[0004] ① Currently, powder-coated doors typically have a double-sided panel + middle frame structure. The panel is usually made of fiberboard, while the middle frame is made of LVL (laminated veneer lumber). Due to the different materials of the surface and middle layers, the different expansion and contraction rates of the panels when heated during the powder coating process can easily lead to unevenness on the edges of the door leaf, resulting in marks.

[0005] ② The adhesive used when bonding the surface fiberboard and the middle frame is usually a cold-pressed, single-component water-based adhesive. This type of adhesive needs to be diluted with water to adjust its viscosity, and its water content is generally around 60%. After bonding, most of the water in the adhesive is absorbed by the surface fiberboard. After the surface board absorbs water, its conductivity increases, resulting in better powder adhesion around the bonding seam. This can cause the powder layer to bulge, making the marks more noticeable. Summary of the Invention

[0006] The main objective of this invention is to provide a powder-coated door and its manufacturing process, aiming to improve the technical problem of imprints on the edges of existing powder-coated door products.

[0007] To achieve the above objectives, the present invention proposes a manufacturing process for a powder-coated door, comprising the following steps:

[0008] S1. A plate of a first material is processed into a substrate, and a plate of a second material is processed into an outer frame and a panel. Multiple substrates are arranged to form a basic frame. A perforated plate is arranged inside the basic frame. The outer frame is wrapped around the basic frame to form an intermediate frame. Multiple first ventilation holes are opened on the intermediate frame. The first ventilation holes pass through the perforated plate, the substrate, and the outer frame.

[0009] S2. After applying glue to the surface of the intermediate frame, the panel is hot-pressed on both sides of the intermediate frame to obtain a blank panel;

[0010] S3. After sealing the edges of the blank board, spray powder to obtain the powder-coated door.

[0011] Preferably, in step S1, the first material of the board is LVL board, and the second material of the board is fiberboard.

[0012] Preferably, in step S1, the first ventilation holes are provided on both sides of the intermediate frame, and the distribution density of the first ventilation holes is 4-6 per m. 2 The diameter of the first vent hole is 1-3mm.

[0013] Preferably, in step S1, the porous plate includes a first porous plate, a second porous plate, and a third porous plate distributed from top to bottom, and the densities of the first porous plate, the second porous plate, and the third porous plate increase in a gradient from small to large.

[0014] The first porous plate is provided with a plurality of first through holes extending along its length, the second porous plate is provided with a plurality of second through holes extending along its length, and the third porous plate is provided with a plurality of third through holes extending along its length. The diameters of the first through holes, the second through holes, and the third through holes decrease in a gradient from small to large.

[0015] Preferably, the density of the first porous plate is 0.3-0.45 g / cm³. 2 The density of the second porous plate is 0.48-0.5 g / cm³. 2 The density of the third porous plate is 0.55-0.65 g / cm³. 2 ;

[0016] The diameter of the first through hole is 0.8-1mm, the diameter of the second through hole is 0.5-0.7mm, and the diameter of the third through hole is 0.2-0.4mm.

[0017] Preferably, in step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120°C, and the hot pressing time is 2-10 min.

[0018] Preferably, in step S2, the adhesive is PUR adhesive, and the application amount of the PUR adhesive is 80-120 g / m³. 2 .

[0019] Preferably, in step S3, the edge sealing step includes: covering the outer frame again around the blank board, wherein the outer frame has a plurality of second ventilation holes, and the second ventilation holes are interconnected with the first ventilation holes.

[0020] Preferably, in step S3, after the blank board is edge-sealed, a UV coating is first applied to the edge of the blank board, and then a powder spraying process is performed.

[0021] The powder spraying step includes: preheating the blank board to a surface temperature of 70-100℃, and then performing electrostatic powder spraying with a powder thickness of 50-100μm.

[0022] In addition, the present invention also proposes a powder spraying gate, which is manufactured by the powder spraying gate manufacturing process described in any of the above claims.

[0023] Compared with the prior art, the powder-coated door and its manufacturing process of the present invention have the following beneficial effects: by adjusting the overall structure, bonding process and edge sealing process of the powder-coated door, no raised marks will appear on the edge of the door after the powder coating is heated.

[0024] 1. A hollow base frame is formed by a substrate, with a perforated plate inside. An outer frame, made of the same material as the surface panel, is formed around the base frame. The surface panel is then heat-pressed onto the top and bottom surfaces. A first vent hole in the middle frame facilitates the release of internal gas during heating. The perforated plate filling the base frame ensures proper surface panel adhesion and facilitates airflow and exhaust after the door is closed. Furthermore, the base frame is encased within the outer frame, which is made of the same material as the surface panel. After the door is formed, all external panels are made of the same fiberboard material, ensuring consistent expansion and contraction at the edges of the panels during powder coating and heating. This allows for easy gas escape and resolves the issue of misalignment of the middle frame due to internal and external pressure differences.

[0025] 2. Use 100% solids PUR adhesive during hot pressing to ensure that the moisture content at the junction of the panel and the middle frame does not change significantly, thus avoiding marks caused by differences in conductivity during subsequent powder coating.

[0026] 3. To ensure a smooth and even finish on the powder-coated door edges after edge sealing, an outer frame is used for edge sealing, reducing the three-layer structure of the edges to a single layer, further minimizing ink marks. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a picture of a traditional powder-coated door, where the arrow at point A points to the marks on the edge.

[0029] Figure 2 This is a schematic cross-sectional view of the powder-coated door of the present invention when the middle frame and the panel are not attached.

[0030] Figure 3 This is a schematic cross-sectional view of the powder-coated door of the present invention after the middle frame and the panel are attached.

[0031] In the attached diagram: 1-substrate, 2-outer frame, 21-first vent, 3-face plate, 4-basic frame, 5-perforated plate, 6-intermediate frame.

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0035] like Figures 2 to 3 As shown, a manufacturing process for a powder-coated door includes the following steps:

[0036] S1. A plate of a first material is processed into a base plate 1, and a plate of a second material is processed into an outer frame 2 and a surface plate 3. Multiple base plates 1 are arranged to form a basic frame 4. A perforated plate 5 is arranged inside the basic frame 4. The outer frame 2 is wrapped around the basic frame 4 to form an intermediate frame 6. Multiple first ventilation holes 21 are opened on the intermediate frame 6. The first ventilation holes 21 pass through the perforated plate 5, the base plate 1 and the outer frame 2.

[0037] S2. After applying glue to the surface of the intermediate frame 6, the surface plate 3 is hot-pressed on both sides of the intermediate frame 6 to obtain the blank plate;

[0038] S3. After sealing the edges of the blank board, spray powder to obtain the powder-coated door.

[0039] This invention adjusts the traditional door structure. First, a hollow rectangular base frame 4 is formed by a base plate 1. The interior of the base frame 4 has a perforated plate 5 (which can be a conventional bridge-hole mechanical board). The base frame 4 is surrounded by four outer frames 2 of the same material as the top panel 3. The four outer frames 2 enclose the base frame 4 to form a middle frame 6. The middle frame 6 of the same material is hot-pressed together with the top and bottom panels 3 to form a blank board. After edge sealing and powder coating, the finished powder-coated door is obtained. Because the outer frames 2 of the middle frame 6 are made of the same material as the top panel 3, the problem of edge marks caused by the different thermal expansion rates of the three layers of panels in traditional powder-coated doors is solved.

[0040] In actual operation, the manufacturing process of the powder spraying gate of the present invention includes the following steps:

[0041] ① Material preparation: Prepare the necessary materials according to the finished dimensions of the wooden door;

[0042] ② Frame Making: A rectangular base frame 4 is formed by cutting and nailing a first-material board (which can be LVL board) according to the molding dimensions. The outer frame 2 is cut from a second-material board (which can be fiberboard) with a thickness of about 22mm. The moisture content of the second-material board should be controlled between 8% and 12%. On the one hand, after the middle frame 6 is completed, multiple first ventilation holes 21 are opened at certain intervals on both sides (the first ventilation holes 21 are preferably opened at the upper and lower horizontal frames of the powder-coated door) to facilitate the discharge of internal gas during heating. On the other hand, the base frame 4 is filled with a grooved bridge-hole mechanical board to ensure the fit of the top panel 3 and to facilitate the flow and exhaust of internal gas after the door is closed. After this process, the base frame 4 is covered by the outer frame 2. The material of the outer frame 2 is the same as that of the top panel 3. That is, after the door is formed, all the external boards are made of the same fiberboard material, which ensures that the expansion and contraction rate of the board edges is consistent during the powder coating and heating process. Internal gas can be easily discharged, solving the problem of displacement of the middle frame due to the pressure difference between the inside and outside.

[0043] ③ Hot-pressed panel 3: First, place a panel 3 (which can be fiberboard) about 9mm thick on the hot press table. Use a glue roller to apply glue to the surface of the fiberboard. After applying the glue, cover it with the middle frame 6. Then, place another panel 3 with glue on the frame and attach it to obtain the blank panel.

[0044] ④ Cut the hot-pressed blank into the required size, and then perform the edge sealing and powder coating processes in sequence. Remember to go to the finished product powder coating door of this solution.

[0045] Furthermore, in step S1, the first material of the board is LVL board, and the second material of the board is fiberboard.

[0046] Laminated veneer lumber (LVL) is a type of sheet material made by gluing together multiple layers of single-panel or spliced ​​veneers in the same direction as the grain. The LVL used in the base plate 1 / basic frame 4 has the following advantages: 1. Uniform structure and good dimensional stability: The laminated structure of LVL greatly reduces the possibility of warping and torsion defects, resulting in good stability and minimal deformation. 2. High strength: It is a material with a high strength-to-weight ratio and uniform structural characteristics. 3. Lower cost and widely available raw materials. The outer frame 2 and the surface panel 3 can be made of fiberboard, which has suitable strength, stable quality, and a certain degree of resistance to deformation and corrosion.

[0047] In addition to the two materials mentioned above, in other embodiments, the first material board or the second material board may also be made of other composite boards or solid wood boards.

[0048] Furthermore, in step S1, the first ventilation holes 21 are provided on both sides of the intermediate frame 6, and the distribution density of the first ventilation holes 21 is 4-6 per m. 2 The diameter of the first vent hole 21 is 1-3mm.

[0049] In this embodiment, the number and diameter of the first vent holes 21 are reasonably set to facilitate better exhaust of gas within the intermediate frame 6.

[0050] Further, in step S1, the porous plate 5 includes a first porous plate, a second porous plate, and a third porous plate distributed from top to bottom, and the density of the first porous plate, the second porous plate, and the third porous plate increases in a gradient from small to large.

[0051] The first porous plate is provided with a plurality of first through holes extending along its length, the second porous plate is provided with a plurality of second through holes extending along its length, and the third porous plate is provided with a plurality of third through holes extending along its length. The diameters of the first through holes, the second through holes, and the third through holes decrease in a gradient from small to large.

[0052] In this embodiment, the porous plate 5 can be a conventional bridge-hole mechanical plate, or it can be a three-layer porous plate 5 with different densities and pore sizes. The density of the first, second, and third porous plates gradually increases from top to bottom, and the pore sizes of the first, second, and third through holes gradually decrease from top to bottom. During the heating process after powder coating, the porous plate 5 with this structure facilitates the uniform heat transfer within the intermediate frame 6. Simultaneously, the gas generated by heating the substrate 1 and the porous plate 5 is evenly dispersed within the three-layer porous plate 5, resulting in more uniform expansion and contraction of the substrate 1 / basic frame 4 within the intermediate frame 6 when heated, leading to a higher quality finished powder-coated door.

[0053] Furthermore, the density of the first porous plate is 0.3-0.45 g / cm³. 2 The density of the second porous plate is 0.48-0.5 g / cm³. 2 The density of the third porous plate is 0.55-0.65 g / cm³. 2 ;

[0054] The diameter of the first through hole is 0.8-1mm, the diameter of the second through hole is 0.5-0.7mm, and the diameter of the third through hole is 0.2-0.4mm.

[0055] When the parameters of the three-layer porous plate 5 are set within the above range, the substrate 1 / base frame 4 inside the middle frame 6 exhibits the most uniform expansion and contraction when heated, resulting in the best quality of the powder-coated door product.

[0056] Furthermore, in step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120℃, and the hot pressing time is 2-10 min.

[0057] In this example, during the hot-pressing process, the pressure after pressing the hot press is set to 8-15 MPa, the hot-pressing time is 2-10 minutes, and the hot-pressing temperature is 80-120℃ to ensure uniform softening of the adhesive and a tighter bond between the surface panel 3 and the intermediate frame 6. After hot pressing, it can be cured for 12-48 hours to fully release the internal stress of the blank board and reduce the risk of subsequent deformation.

[0058] Further, in step S2, the adhesive is PUR adhesive, and the application amount of the PUR adhesive is 80-120 g / m³. 2 In this embodiment, a 100% solids content PUR adhesive is used, with an application rate of 80-120 g / m². 2 PUR adhesive, short for moisture-curing reactive polyurethane hot melt adhesive, is mainly composed of isocyanate-terminated polyurethane prepolymer and is a single-component product. Thus, the moisture content at the junction of panel 3 and intermediate frame 6 will not change significantly, avoiding marks during subsequent powder coating due to differences in conductivity. In other words, by optimizing the bonding process of panel 3, the problem of uneven moisture content inside the powder-coated door is solved, further ensuring that the final powder-coated door has no marks on its edges.

[0059] Furthermore, in step S3, the edge sealing step includes: covering the outer frame 2 again around the blank board, wherein the outer frame 2 has a plurality of second ventilation holes, and the second ventilation holes are interconnected with the first ventilation holes 21.

[0060] In this embodiment, when using an excessively thin edge-sealing material, slight marks may still appear on the edges during subsequent powder coating and heating due to the fiberboard arrangement direction. To ensure an absolutely smooth and flat edge, this invention uses a sufficiently thick outer frame 2 to seal the edges again. During actual installation, a fiberboard with a thickness of approximately 12mm is used in conjunction with PUR adhesive to transform the three-layer structure of the edges into a single-layer structure. The amount of PUR adhesive applied is 120-180g / m². 2 .

[0061] Note: All powder coating doors require hanging holes. The first vent 21 / second vent of this invention also serve as hanging holes, and a decorative cover needs to be added after powder coating. The hanging holes are support points for suspending the items to be coated on the brushing stand or spraying equipment to maintain the stability and fixation of the items during the spraying process.

[0062] In summary, this solution provides a powder-coated door and its manufacturing process. By adjusting the overall structure, bonding process, and edge sealing process of the powder-coated door, raised marks will not appear on the edges of the door after the powder coating is heated.

[0063] Further, in step S3, after the blank board is edge-sealed, a UV coating is first applied to the edge of the blank board, and then a powder spraying process is performed; the powder spraying process includes: preheating the blank board to a surface temperature of 70-100℃, and then performing electrostatic powder spraying with a powder thickness of 50-100μm.

[0064] In this embodiment, UV coating is applied to the flat edge of the sealed blank by roller to ensure that the edge is smooth and flat after roller coating, which can improve the moisture resistance of the powder-coated door product. The film thickness of the UV coating is about 0.25mm.

[0065] In the powder coating process, the blank board is first preheated to raise the temperature of the board surface to 70-100℃ before powder coating is applied. The thickness of the powder coating layer is 50-100μm, and finally it is melted and cured at high temperature.

[0066] In addition, the present invention also proposes a powder spraying gate 4, which is manufactured by the powder spraying gate 4 manufacturing process described in any of the above claims. Since the powder spraying gate 4 is manufactured by any of the above powder spraying gate manufacturing processes, it has the same beneficial effects as described above, which will not be repeated here.

[0067] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0068] Comparative Example 1

[0069] Conventional powder-coated doors: adopt a structure of double-sided surface panels (fiberboard) + middle frame (LVL board).

[0070] Comparative Example 2

[0071] A manufacturing process for a powder-coated door includes the following steps:

[0072] S1. A sheet of material of the first type is processed into a base plate 1, and a sheet of material of the second type is processed into an outer frame 2 and a surface plate 3. Multiple base plates 1 are used to form a basic frame 4, and a perforated plate 5 (density 0.35 g / cm³) is arranged within the basic frame 4. 2 The bridge hole mechanical board has the same size for all through holes, with a diameter of 0.8mm. The outer frame 2 is wrapped around the base frame 4 to form the middle frame 6.

[0073] S2. Apply melamine adhesive to the surface of the intermediate frame 6, with an adhesive application rate of 100g / m². 2Then, the surface plate 3 is hot-pressed on both sides of the middle frame 6 to obtain the blank plate. The hot-pressing pressure is 18 MPa, the hot-pressing temperature is 125℃, and the hot-pressing time is 5 min.

[0074] S3. Use conventional paper edge banding strips to seal the edges of the blank board, then preheat the blank board to a surface temperature of 90℃ and perform electrostatic powder spraying with a powder thickness of 60μm to obtain the powder-coated door.

[0075] Example 1

[0076] The preparation steps in this embodiment are the same as those in Comparative Example 2, except that in step S1, five first ventilation holes 21 are provided at intervals on both sides of the middle frame 6. The diameter of the first ventilation hole 21 is 3mm, and the first ventilation hole 21 passes through the porous plate 5, the substrate 1 and the outer frame 2.

[0077] Example 2

[0078] All preparation steps in this embodiment are the same as in Embodiment 1, except that in step S2, PUR adhesive is applied to the surface of the intermediate frame 6.

[0079] Example 3

[0080] All preparation steps in this embodiment are the same as in Example 1. The only difference is that in step S2, the parameters during hot pressing in this embodiment are adjusted as follows: hot pressing pressure 12 MPa, hot pressing temperature 110°C, and hot pressing time 5 min.

[0081] Example 4

[0082] The preparation steps in this embodiment are the same as in Example 1, except that: in this embodiment, an outer frame (i.e., fiberboard) with a second vent is used to seal the edges of the blank board by covering it with PUR adhesive, and the amount of PUR adhesive applied is 150g / m². 2 .

[0083] Example 5

[0084] All preparation steps in this embodiment are the same as in Example 1, except that the porous plate in this embodiment is adjusted, as shown in the table below:

[0085]

[0086] The powder-coated doors prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance testing. The specific test results are shown in the table below:

[0087]

[0088] Note: Fifty powder-coated doors were prepared using the preparation steps of both the above-described examples and comparative examples. The presence or absence of marks on the edges of the finished powder-coated doors was observed, and the total number of products with marks was recorded. The yield rate is calculated as follows: (Number of powder-coated doors without edge marks / Total number of powder-coated doors) × 100%

[0089] As shown in the test results of Comparative Example 1 above, after powder coating and heating, the edges of the finished powder-coated door with a conventional structure are prone to imprints, which seriously affects the appearance of the finished product. After adjusting the structure, without opening the first vent hole, as shown in the test results of Comparative Example 2, even though the outer frame completely covers the internal perforated plate and basic frame, reducing the imprints, the internal gas cannot be completely discharged, causing the middle frame to expand during the powder coating and heating process. The pressure difference between the inside and outside causes the middle frame to shift and deform to a certain extent. The expansion and contraction rates of the upper and lower panels are still inconsistent, so the improvement in yield is still not significant.

[0090] As can be seen from the test results of Example 1, when the first vent is provided, the gas inside the middle frame can be discharged in time, the problem of imprints on the edge of the powder coating door is significantly reduced, and the yield rate can be increased to about 60%.

[0091] As can be seen from the test results of Example 2, when the preferred PUR adhesive is selected for hot pressing based on Example 1, the moisture content will not change significantly due to the low solid content, and the imprint on the edge of the powder-coated door can be further reduced, and the yield rate can be increased to about 76%.

[0092] As can be seen from the test results of Example 3, when the preferred hot pressing parameters are used based on Example 1, the glue softening can be guaranteed to be uniform, and the yield of powder-coated doors can be improved.

[0093] As shown in the test results of Example 4, when the entire blank board is edge-sealed once using an outer frame based on Example 1, the edge of the entire powder coating door changes from a three-layer structure to a one-layer structure, which can minimize the imprint problem on the edge of the powder coating door and increase the yield to about 90%. However, due to issues such as the glue used in the middle frame, the hot pressing parameters, and the perforated plate, the gas inside the middle frame is not evenly dispersed during the powder coating heating process. This affects the outermost edge-sealing frame, causing it to shift slightly. Slight unevenness will appear at the joints of the multiple outer frames around the blank board. Therefore, the yield has not yet reached 100%.

[0094] As can be seen from the test results of Example 5, when a porous plate with three different pore sizes and densities is selected based on Example 1, the gas in the middle frame is evenly dispersed, and the problem of imprints at the edge of the powder spraying door is reduced.

[0095] Example 6

[0096] A manufacturing process for a powder-coated door includes the following steps:

[0097] S1. The LVL board is processed into a base plate 1, and the fiberboard is processed into an outer frame 2 and a surface plate 3. Multiple base plates 1 are arranged to form a basic frame 4. A perforated plate 5 is arranged in the basic frame 4. The outer frame 2 is wrapped around the basic frame 4 to obtain an intermediate frame 6. Six first ventilation holes 21 (the diameter of the first ventilation hole 21 is 3mm) are opened on the intermediate frame 6. The first ventilation holes 21 pass through the perforated plate 5, the base plate 1 and the outer frame 2.

[0098] The porous plate 5 comprises a first porous plate, a second porous plate, and a third porous plate arranged sequentially from top to bottom, with the densities of the first, second, and third porous plates increasing in a gradient from small to large; the density of the first porous plate is 0.4 g / cm³. 2 The diameter of the first through hole in the first porous plate is 0.8 mm; the density of the second porous plate is 0.48 g / cm³. 2 The diameter of the second through hole is 0.6 mm; the density of the third porous plate is 0.6 g / cm³. 2 The diameter of the third through hole is 0.3 mm;

[0099] S2. Apply PUR adhesive to the surface of the intermediate frame 6 (adhesive application rate: 100g / m²). 2 After that, the surface plate 3 is hot-pressed on both sides of the middle frame 6 to obtain the blank plate, wherein the pressure during hot pressing is 12 MPa, the hot pressing temperature is 115℃, and the hot pressing time is 6 min.

[0100] S3. The outer frame 2 containing the second vent (the vent diameter is the same as the first vent 21) is wrapped around the blank board to seal the edges. Then, the blank board is preheated to a surface temperature of 90°C and electrostatic powder spraying is performed. The powder spraying thickness is 80μm, thus obtaining the powder spraying door.

[0101] The powder-coated gate prepared in Example 6 was subjected to performance testing, and the specific test results are shown in the table below:

[0102]

[0103] As can be seen from the test results in the table above, by further optimizing the glue, hot pressing parameters, edge sealing process, and perforated plate settings used in hot pressing, the problem of imprints on the edges of the powder-coated door can be basically avoided, the yield rate is high, and the powder-coated door produced is more harmonious overall and has a better appearance.

[0104] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A manufacturing process for a powder-coated door, characterized in that, Includes the following steps: S1. The first material plate is processed into a base plate (1), and the second material plate is processed into an outer frame (2) and a panel (3). Multiple base plates (1) are arranged to form a basic frame (4). A perforated plate (5) is arranged in the basic frame (4). The outer frame (2) is wrapped around the basic frame (4) to obtain an intermediate frame (6). Multiple first ventilation holes (21) are opened on the intermediate frame (6). The first ventilation holes (21) pass through the perforated plate (5), the base plate (1) and the outer frame (2). In step S1, the porous plate (5) includes a first porous plate, a second porous plate, and a third porous plate arranged sequentially from top to bottom. The density of the first porous plate, the second porous plate, and the third porous plate increases in a gradient from small to large. The first porous plate is provided with a plurality of first through holes extending along its length direction. The second porous plate is provided with a plurality of second through holes extending along its length direction. The third porous plate is provided with a plurality of third through holes extending along its length direction. The diameter of the first through holes, the second through holes, and the third through holes decreases in a gradient from small to large. S2. After applying glue to the surface of the intermediate frame (6), the panel (3) is hot-pressed on both sides of the intermediate frame (6) to obtain the blank board; S3. After sealing the edges of the blank board, spray powder to obtain the powder-coated door.

2. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S1, the first material is LVL board, and the second material is fiberboard.

3. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S1, the first ventilation holes (21) are provided on both sides of the intermediate frame (6), and the distribution density of the first ventilation holes (21) is 4-6 per m. 2 The diameter of the first vent (21) is 1-3 mm.

4. The manufacturing process of a powder-coated door according to claim 1, characterized in that, The density of the first porous plate is 0.3-0.45 g / cm³. 2 The density of the second porous plate is 0.48-0.5 g / cm³. 2 The density of the third porous plate is 0.55-0.65 g / cm³. 2 ; The diameter of the first through hole is 0.8-1mm, the diameter of the second through hole is 0.5-0.7mm, and the diameter of the third through hole is 0.2-0.4mm.

5. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120℃, and the hot pressing time is 2-10 min.

6. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S2, the adhesive is PUR adhesive, and the application amount of the PUR adhesive is 80-120 g / m³. 2 .

7. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S3, the edge sealing step includes: covering the outer frame (2) again around the blank board, the outer frame (2) having multiple second ventilation holes, the second ventilation holes being interconnected with the first ventilation hole (21).

8. The manufacturing process of a powder-coated door according to claim 1, characterized in that, In step S3, after the blank board is edge-sealed, a UV coating is first applied to the edge of the blank board, and then a powder spraying process is performed. The powder spraying step includes: preheating the blank board to a surface temperature of 70-100℃, and then performing electrostatic powder spraying with a powder thickness of 50-100μm.

9. A powder spraying door, characterized in that, It is manufactured by the powder spraying gate manufacturing process according to any one of claims 1-8.

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