Powder spraying door and manufacturing process thereof

Abstract

The invention relates to the technical field of door body preparation, in particular to a powder spraying door and a manufacturing process thereof. The manufacturing process of the powder spraying door comprises the following steps that S1, a plate made of a first material is machined into base plates, a plate made of a second material is machined into an outer frame and a surface plate, a foundation frame is defined by the multiple base plates, a perforated plate is arranged in the foundation frame, the periphery of the foundation frame is wrapped with the outer frame, and a middle frame is obtained; a plurality of first air holes are formed in the middle frame, and the first air holes penetrate through the porous plate, the base plate and the outer frame; s2, after glue is applied to the surface of the middle frame, the surface boards are subjected to hot pressing on the two faces of the middle frame, and blank boards are obtained; and S3, the blank plate is subjected to edge sealing and powder spraying, and the powder spraying door is obtained. By adjusting the overall structure, the attaching procedure and the edge sealing procedure of the powder spraying door, the edge portion of the door body cannot have protruding marks after powder spraying and heating.

Description

Technical Field

[0001] The present invention relates to the technical field of door body preparation, in particular to a powder spraying door and a manufacturing process thereof. Background Art

[0002] The investigation found that the powder-coated door products currently on the market usually have the following problems on the edges of the door leaf: Figure 1 The mark shown at A in the middle makes the overall appearance of the door leaf product unsightly.

[0003] It has been verified that the formation of the above-mentioned marks is mainly related to the three-layer structure of the door leaf and the selected bonding glue: ① The current powder-coated doors usually have a double-sided surface panel + middle frame structure. The surface panel is generally made of fiberboard, and 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 uneven edges of the door leaf and thus marks.

[0004] ② The glue used to bond the surface fiberboard to the middle frame is typically a cold-pressed, single-component, water-based adhesive. This adhesive needs to be diluted with water to adjust viscosity, and typically has a moisture content of around 60%. After bonding, the moisture in the adhesive is largely absorbed by the surface fiberboard. This absorbs water, increasing its conductivity and causing powder to bulge around the bond seam, making the mark more noticeable. Summary of the Invention

[0005] The main purpose of the present invention is to provide a powder-sprayed door and a manufacturing process thereof, aiming to improve the technical problem of imprints on the edges of existing powder-sprayed door leaf products.

[0006] To achieve the above object, the present invention proposes a manufacturing process for a powder-sprayed door, comprising the following steps: S1. Processing a plate of a first material into a substrate, processing a plate of a second material into an outer frame and a surface plate, enclosing a plurality of the substrates into a base frame, laying a porous plate within the base frame, wrapping the outer frame around the base frame to obtain an intermediate frame, and opening a plurality of first ventilation holes on the intermediate frame, wherein the first ventilation holes penetrate the porous plate, the substrate, and the outer frame; S2. After applying glue to the surface of the intermediate frame, hot pressing the surface plate on both sides of the intermediate frame to obtain a embryonic plate; S3. The blank is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

[0007] Preferably, in step S1, the board made of the first material is an LVL board, and the board made of the second material is a fiberboard.

[0008] Preferably, in step S1, the first ventilation holes are opened on both sides of the middle frame, and the distribution density of the first ventilation holes is 4-6 / m 2 The aperture of the first air vent is 1-3 mm.

[0009] Preferably, in step S1, the porous plate includes a first porous plate, a second porous plate and a third porous plate sequentially 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; 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, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

[0010] Preferably, the density of the first porous plate is 0.3-0.45 g / cm 2 The density of the second porous plate is 0.48-0.5 g / cm 2 The density of the third porous plate is 0.55-0.65 g / cm 2 ; The aperture of the first through hole is 0.8-1 mm, the aperture of the second through hole is 0.5-0.7 mm, and the aperture of the third through hole is 0.2-0.4 mm.

[0011] 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.

[0012] Preferably, in step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120g / m 2 .

[0013] Preferably, in step S3, the edge sealing step includes: wrapping the outer frame around the four sides of the embryonic board again, the outer frame is provided with a plurality of second ventilation holes, and the second ventilation holes are connected to the first ventilation holes.

[0014] Preferably, in step S3, after the edge of the blank is sealed, UV coating is first applied to the edge of the blank, and then a powder spraying process is performed; The powder spraying step includes: preheating the embryo plate to a plate surface temperature of 70-100° C., and then performing electrostatic powder spraying with a powder spraying thickness of 50-100 μm.

[0015] In addition, the present invention also provides a powder-spraying door, which is manufactured by any of the above-mentioned manufacturing processes for the powder-spraying door.

[0016] Compared with the prior art, the powder-sprayed 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-sprayed door, no raised marks will appear on the edge of the door body after powder spraying and heating.

[0017] 1. The base plate forms a hollow base frame, with a porous plate inside. The base frame is surrounded by an outer frame made of the same material as the panel, and the upper and lower sides are then hot-pressed to fit the panel. The middle frame is provided with a first air vent to facilitate the discharge of internal gas during heating. The base frame is filled with porous plates to ensure the panel fits, while facilitating internal gas circulation and exhaust after the door leaf is closed. Furthermore, the base frame is wrapped inside by an outer frame made of the same material as the panel. After the door leaf is formed, all external panels are made of fiberboard of the same material, ensuring consistent expansion and contraction of the panel edges during powder spraying and heating. Internal gas can be easily discharged, solving the problem of the middle frame shifting due to the pressure difference between the inside and outside.

[0018] 2. Use 100% solid content PUR glue during hot pressing to prevent significant changes in the moisture content at the junction of the surface panel and the intermediate frame, thus avoiding marks during subsequent powder spraying due to differences in conductivity.

[0019] 3. In order to ensure the smoothness of the edge of the powder-coated door after edge sealing, an outer frame is used to seal the edge, changing the edge from a three-layer structure to a one-layer structure, further reducing the imprint problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a real picture of a traditional powder-sprayed door, where the arrow at A indicates the mark on the edge; Figure 2 This is a schematic diagram of the cross-sectional structure of the powder spraying door of the present invention when the middle frame and the surface plate are not attached; Figure 3 It is a schematic diagram of the cross-sectional structure of the powder spraying door of the present invention after the middle frame and the surface plate are bonded together.

[0022] In the accompanying drawings: 1-base plate, 2-outer frame, 21-first air vent, 3-surface plate, 4-base frame, 5-porous plate, 6-middle frame.

[0023] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] like Figures 2 to 3 As shown, a manufacturing process of a powder spraying door includes the following steps: S1. A plate of a first material is processed into a substrate 1, and a plate of a second material is processed into an outer frame 2 and a surface plate 3. Multiple substrates 1 are enclosed to form a base frame 4, a porous plate 5 is arranged in the base frame 4, and the outer frame 2 is wrapped around the base frame 4 to obtain an intermediate frame 6. A plurality of first air holes 21 are opened on the intermediate frame 6, and the first air holes 21 pass through the porous plate 5, the substrate 1 and the outer frame 2; S2. After applying glue to the surface of the intermediate frame 6, hot pressing the surface plate 3 on both sides of the intermediate frame 6 to obtain a embryonic plate; S3. The blank is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

[0027] The present invention modifies the traditional door leaf structure. A base plate 1 encloses a rectangular, hollow base frame 4. A porous plate 5 (which can be a conventional bridge tunnel mechanical plate) is installed inside the base frame 4. Four outer frames 2, made of the same material as the outer panels 3, surround the base frame 4, forming an intermediate frame 6. The intermediate frames 6, made of the same material, are then heat-pressed and bonded to the upper and lower outer panels 3 to form a blank. Edge sealing and powder coating are then performed to create the finished powder-coated door. Because the outer frames 2 outside the intermediate frames 6 are made of the same material as the outer panels 3, this solves the edge marking problem of traditional powder-coated doors caused by the different thermal expansion and contraction rates of the three layers of material.

[0028] In actual operation, the manufacturing process of the powder spraying door of the present invention includes the following steps: ①Material preparation: Prepare the required materials according to the molding size of the wooden door; ② Framing: A rectangular base frame 4 is cut and nailed from a first material (preferably LVL) to the desired dimensions. The outer frame 2 is cut from a second material (preferably fiberboard) approximately 22 mm thick. The moisture content of the second material is kept to a minimum of 8%-12%. After the intermediate frame 6 is completed, multiple first ventilation holes 21 are spaced apart on either side (preferably located on the upper and lower transverse frames of the powder-coated door) to facilitate the escape of internal air during heating. Furthermore, the base frame 4 is filled with slotted mechanical panels to ensure a secure fit to the outer panel 3 and facilitate internal airflow and exhaust after the door leaf is closed. After this process is complete, the base frame 4 is enclosed by the outer frame 2, which is made of the same material as the outer panel 3. This means that after the door leaf is formed, all external panels are made of the same fiberboard material. This ensures consistent expansion and contraction of the panels' edges during powder coating and heating, allowing for easy escape of internal air and resolving any misalignment of the intermediate frame due to internal and external pressure differentials.

[0029] ③ Hot pressing surface plate 3: First place the surface plate 3 (which can be fiberboard) of the door leaf about 9mm on the hot press table, use a glue roller to apply glue on the surface of the fiberboard, cover it with the middle frame 6 after gluing, and then cover the other surface plate 3 coated with glue on the frame to obtain the embryonic plate.

[0030] ④Cut the hot-pressed blank into the required size, and then carry out the edge sealing and powder spraying processes in sequence. Remember to refer to the finished powder-sprayed door of this plan.

[0031] Furthermore, in step S1, the board made of the first material is an LVL board, and the board made of the second material is a fiberboard.

[0032] Laminated veneer lumber, or LVL, is a board made by gluing together multiple layers of whole or spliced ​​veneers along the grain. The LVL board used in the base plate 1 / foundation frame 4 has the following advantages: 1. Uniform structure and good dimensional stability. The laminated structure of LVL greatly reduces the possibility of defects such as warping and torsion in the board, and it has good stability and small deformation. 2. High strength, a material with a very high strength-to-weight ratio and uniform structural properties. 3. Low cost and a wide range of raw material sources. The outer frame 2 and the surface panel 3 can be made of fiberboard, which has appropriate strength, stable quality, and a certain degree of resistance to deformation and corrosion.

[0033] In addition to the above two materials, in other embodiments, the board of the first material or the board of the second material may also be a synthetic board of other materials or directly a solid wood board.

[0034] Furthermore, in step S1, the first ventilation holes 21 are opened on both sides of the middle frame 6, and the distribution density of the first ventilation holes 21 is 4-6 / m 2The diameter of the first air vent 21 is 1-3 mm.

[0035] In this embodiment, the number and diameter of the first air holes 21 are reasonably set to facilitate better discharge of the gas in the middle frame 6 .

[0036] Furthermore, in step S1, the porous plate 5 includes a first porous plate, a second porous plate and a third porous plate sequentially 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; 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, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

[0037] In this embodiment, in addition to being able to use conventional bridge hole mechanical plates, the porous plate 5 can also be a three-layer structured porous plate 5 with different densities and pore sizes. Among them, the density of the first porous plate, the second porous plate, and the third porous plate gradually increases from top to bottom, and the pore sizes of the first through hole, the second through hole, and the third through hole gradually decrease from top to bottom. The porous plate 5 with the above structure is conducive to the uniform transfer of heat within the intermediate frame 6 during the heating process after powder spraying. At the same time, the gas generated by the substrate 1 and the porous plate 5 due to heating will be evenly dispersed within the three-layer structured porous plate 5, so that the expansion and contraction degree of the substrate 1 / basic frame 4 inside the intermediate frame 6 when heated is more uniform, and the resulting powder sprayed door product is of better quality.

[0038] Furthermore, the density of the first porous plate is 0.3-0.45 g / cm 2 The density of the second porous plate is 0.48-0.5 g / cm 2 The density of the third porous plate is 0.55-0.65 g / cm 2 ; The aperture of the first through hole is 0.8-1 mm, the aperture of the second through hole is 0.5-0.7 mm, and the aperture of the third through hole is 0.2-0.4 mm.

[0039] When the parameters of the three-layer structure porous plate 5 are set to the above range, the expansion and contraction degree of the substrate 1 / basic frame 4 inside the middle frame 6 when heated is most uniform, and the quality of the obtained powder spraying door product is relatively best.

[0040] Furthermore, 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.

[0041] In this example, during the hot pressing process, the pressure is set at 8-15 MPa, the pressing time is 2-10 minutes, and the temperature is 80-120°C. This ensures uniform softening of the glue and a tighter fit between the surface plate 3 and the intermediate frame 6. After hot pressing, the substrate can be cured for 12-48 hours to fully release stress within the substrate and reduce the risk of subsequent deformation.

[0042] Furthermore, in step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120g / m 2 In this embodiment, 100% solid content PUR glue is used, and the glue coating amount is 80-120g / m 2 PUR glue, short for moisture-curing reactive polyurethane hot melt adhesive, is primarily composed of a single-component isocyanate-terminated polyurethane prepolymer. This prevents significant changes in moisture content at the junction of the face plate 3 and the intermediate frame 6, preventing subsequent powder coating marks caused by differences in conductivity. This optimizes the lamination process for the face plate 3, resolving the issue of locally uneven moisture content within the powder-coated door and further ensuring a smooth edge finish on the finished door.

[0043] Furthermore, in step S3 , the edge sealing step includes: wrapping the outer frame 2 around the embryonic board again, the outer frame 2 is provided with a plurality of second ventilation holes, and the second ventilation holes are communicated with the first ventilation holes 21 .

[0044] In this embodiment, when too thin edge sealing material is used, slight marks may still appear on the edge during the subsequent powder spraying and heating due to the problem of the fiberboard arrangement direction. In order to ensure that the edge is absolutely flat and smooth, the present invention uses a sufficiently thick outer frame 2 to seal the edge again; in actual installation, a fiberboard with a thickness of about 12mm is used with PUR glue to change the edge from a three-layer structure to a single-layer structure. The amount of PUR glue applied is 120-180g / m 2 .

[0045] Note: All powder coating doors require hanging holes. The first and second air holes in this invention also serve as hanging holes and need to be covered with decorative covers after powder coating. Hanging holes are used as support points for hanging the object to be sprayed on the painting stand or spray equipment to maintain the object's stability and fixation during the spraying process.

[0046] In summary, this solution provides a powder-sprayed door and its manufacturing process. By adjusting the overall structure, laminating process and edge sealing process of the powder-sprayed door, no raised marks will appear on the edge of the door body after powder spraying and heating.

[0047] Furthermore, in step S3, after the edge of the embryonic board is sealed, UV coating is first applied to the edge of the embryonic board, and then a powder spraying process is performed; the powder spraying step includes: preheating the embryonic board to a board surface temperature of 70-100°C, and then performing electrostatic powder spraying, and the powder spraying thickness is 50-100μm.

[0048] In this embodiment, UV coating is applied by roller to the edge of the embryonic board after edge sealing to ensure that the edge is flat and smooth after roller coating, thereby improving the moisture-proof performance of the powder-coated door product. The film thickness of the UV coating is about 0.25 mm.

[0049] In the powder spraying step, the blank is first preheated to raise the temperature of the board surface to 70-100°C, and then powder spraying is carried out. The thickness of the powder spraying layer is 50-100μm, and finally it is melted and solidified at high temperature.

[0050] In addition, the present invention further provides a powder spraying door 4 manufactured by any of the above-mentioned manufacturing processes for the powder spraying door 4. The powder spraying door 4 manufactured by any of the above-mentioned manufacturing processes for the powder spraying door has the same beneficial effects as described above, which will not be described in detail here.

[0051] The technical solutions of the present invention are further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0052] Comparative Example 1 Conventional powder-coated door: adopts the structure of double-sided surface panel (fiberboard) + middle layer frame (LVL board).

[0053] Comparative Example 2 A manufacturing process for a powder-sprayed door comprises the following steps: S1. Process the plate of the first material into a substrate 1, and process the plate of the second material into an outer frame 2 and a surface plate 3. Multiple substrates 1 are enclosed into a basic frame 4, and a porous plate 5 (density 0.35g / cm 2 The bridge hole mechanical plate has the same size of each through hole, and the diameter is 0.8 mm), and the outer frame 2 is wrapped around the base frame 4 to obtain the intermediate frame 6; S2. Apply melamine glue on the surface of the middle frame 6, with a glue amount of 100g / m 2 , then hot pressing the surface plate 3 on both sides of the middle frame 6 to obtain a blank plate, wherein the pressure during hot pressing is 18 MPa, the hot pressing temperature is 125° C., and the hot pressing time is 5 minutes; S3. Use conventional paper edge banding strips to seal the edges of the embryonic board. Then preheat the embryonic board to a board surface temperature of 90°C and perform electrostatic powder spraying with a powder coating thickness of 60μm to obtain a powder-coated door.

[0054] Example 1 All the preparation steps in this embodiment are consistent with those in comparative example 2, with the only difference being that in step S1, five first air holes 21 are spaced apart on both sides of the middle frame 6, the aperture of the first air holes 21 is 3 mm, and the first air holes 21 pass through the porous plate 5, the substrate 1 and the outer frame 2.

[0055] Example 2 All preparation steps in this embodiment are consistent with those in Example 1, with the only difference being that in step S2 , PUR glue is applied to the surface of the middle frame 6 in this embodiment.

[0056] Example 3 All preparation steps in this embodiment are consistent with those in Example 1, with the only difference being that, in step S2, the parameters during hot pressing in this embodiment are adjusted to: hot pressing pressure 12 MPa, hot pressing temperature 110° C., and hot pressing time 5 min.

[0057] Example 4 The preparation steps in this embodiment are the same as those in embodiment 1, with the only difference being that this embodiment uses an outer frame (i.e., fiberboard) with a second vent hole and PUR glue to cover the four sides of the embryo board for edge sealing. The amount of PUR glue applied is 150g / m 2 .

[0058] Example 5 The preparation steps in this embodiment are consistent with those in Example 1, with the only difference being that the porous plate in this embodiment is adjusted, as shown in the following table:

[0059] The powder-sprayed doors prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests, and the specific test results are shown in the following table:

[0060] Note: 50 powder-coated doors were prepared using the steps of the above embodiment and comparative example respectively. The edges of the finished powder-coated doors were observed for marks, and the total number of products with marks was recorded. The yield rate = (number of powder-coated doors with no marks on the edges / total number of powder-coated doors) × 100% As can be seen from the test results in Comparative Example 1 in the table above, the edges of the powder-coated door products with conventional structures are prone to marks after powder spraying and heating, seriously affecting the appearance of the powder-coated door products. After the structure is adjusted and the first air vent is not opened, as shown in the test results of Comparative Example 2, even if the outer frame completely covers the internal porous plate and base frame, the marks are reduced. However, since the internal gas cannot be completely discharged, the interior of the middle frame expands during the powder spraying and heating process. The pressure difference between the inside and outside causes the middle frame to shift and produce a certain amount of deformation. There is still an inconsistency between the expansion and contraction rates of the upper and lower surface plates, so the yield rate improvement effect is still not obvious.

[0061] It can be seen from the test results of Example 1 that when the first air vent is opened, the gas inside the middle frame can be discharged in time, the imprint problem on the edge of the powder spraying door is significantly reduced, and the yield rate can be increased to about 60%.

[0062] It can be seen from the test results of Example 2 that when the preferred PUR glue is selected for hot pressing on the basis of Example 1, the moisture content will not change significantly due to the lower solid content, the imprint on the edge of the powder-sprayed door can be further reduced, and the yield rate can be increased to about 76%.

[0063] It can be seen from the test results of Example 3 that when the preferred hot pressing parameters are adopted on the basis of Example 1, the glue can be softened evenly and the yield rate of the powder-sprayed door can be improved.

[0064] The test results of Example 4 show that when the outer frame is used to perform a single edge sealing on the entire blank based on Example 1, the edge of the entire powder-sprayed door is reduced from a three-layer structure to a single-layer structure, which can minimize the problem of imprinting on the edge of the powder-sprayed door and increase the yield rate to approximately 90%. However, due to issues such as the glue used in the intermediate frame, hot pressing parameters, and the porous plate, the gas dispersion within the intermediate frame is not uniform during the powder spraying heating process, which affects the outer edge-sealing frame at the outermost edge, causing it to slightly deviate. This will also cause slight unevenness at the joints of the multiple outer frames around the blank. Therefore, the yield rate has not yet reached 100%.

[0065] The test results of Example 5 show that when three layers of porous plates with different pore sizes and densities are selected on the basis of Example 1, the gas in the middle frame is evenly dispersed and the imprint problem at the edge of the powder spraying door is reduced.

[0066] Example 6 A manufacturing process for a powder-sprayed door comprises the following steps: S1. LVL board is processed into base plate 1, fiberboard is processed into outer frame 2 and surface plate 3, multiple base plates 1 are enclosed to form a base frame 4, porous plate 5 is arranged in the base frame 4, outer frame 2 is wrapped around the base frame 4 to obtain an intermediate frame 6, and six first ventilation holes 21 (the aperture of the first ventilation holes 21 is 3 mm) are opened on the intermediate frame 6. The first ventilation holes 21 pass through the porous plate 5, base plate 1 and outer frame 2; The porous plate 5 includes a first porous plate, a second porous plate and a third porous plate, which are sequentially distributed from top to bottom. The density of the first porous plate, the second porous plate and the third porous plate increases from small to large in a gradient manner. The density of the first porous plate is 0.4 g / cm 2 The diameter of the first through hole of the first porous plate is 0.8 mm; the density of the second porous plate is 0.48 g / cm 2 The diameter of the second through hole is 0.6 mm; the density of the third porous plate is 0.6 g / cm 2 , the aperture of the third through hole is 0.3 mm; S2. Apply PUR glue (applying amount is 100g / m2) on the surface of the middle frame 6. 2 ), hot pressing the surface plate 3 on both sides of the middle frame 6 to obtain a blank plate, wherein the pressure during hot pressing is 12 MPa, the hot pressing temperature is 115° C., and the hot pressing time is 6 minutes; S3. The outer frame 2 containing a second vent hole (aperture consistent with the first vent hole 21) is wrapped around the embryonic plate for edge sealing. The embryonic plate is then preheated to a surface temperature of 90°C and electrostatically powdered to a powder thickness of 80μm to obtain a powder-coated door.

[0067] The powder-sprayed door prepared in Example 6 was subjected to performance testing, and the specific test results are shown in the following table:

[0068] The test results in the table above show that by further optimizing the glue, hot pressing parameters, edge sealing process, and porous plate settings used during hot pressing, the problem of imprints on the edges of powder-coated doors can be basically avoided, the yield rate is high, and the resulting powder-coated door is more harmonious overall and has a better appearance.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A manufacturing process for a powder spraying door, characterized in that: The steps include: S1. Processing a plate of a first material into a substrate (1), processing a plate of a second material into an outer frame (2) and a surface plate (3), enclosing a plurality of the substrates (1) into a basic frame (4), arranging a porous plate (5) in the basic frame (4), wrapping the outer frame (2) around the basic frame (4) to obtain an intermediate frame (6), and opening a plurality of first air holes (21) on the intermediate frame (6), wherein the first air holes (21) pass through the porous plate (5), the substrate (1) and the outer frame (2); S2. After applying glue on the surface of the intermediate frame (6), hot pressing the surface plate (3) on both sides of the intermediate frame (6) to obtain a blank; S3. The blank is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

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

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

4. A manufacturing process for a powder spraying door according to claim 1 or 3, characterized in that: In step S1, the porous plate (5) includes a first porous plate, a second porous plate and a third porous plate, which are sequentially 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; 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, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

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

6. The manufacturing process of a powder spraying 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° C., and the hot pressing time is 2-10 min.

7. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120g / m 2 .

8. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S3, the edge sealing step includes: wrapping the outer frame (2) around the four sides of the embryonic plate again, the outer frame (2) is provided with a plurality of second air holes, and the second air holes are connected to the first air holes (21).

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

10. A powder spraying door, characterized in that: The powder-spraying door is manufactured by the manufacturing process of any one of claims 1 to 9.

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